Personally, I have the S3 for the following 10 reasons even though I'm a huge Apple fan:
1- removable battery
2- removable storage
3- larger screen
4- plug and play
5- more customizable
6- more useful features (NTC tags, Google Wallet, etc.)
7- backs up with Google
8- works easily without any platform (no itunes required)
9- has many document editing options
10- SwiftKey3 is the best keyboard out there, with Swype 4.3 a close second. Both better than Apples keyboards.